The surfactant/albumin ratio by fluorescence polarization is performed to assess what physiological state?

• A. Hyperlipidemia
• B. Coronary artery disease
• C. Hemolytic disease of the newborn
• D. Fetal lung maturity

Answer: (D)

Surfactant/albumin ratio by fluorescence polarization is a test of fetal lung maturity. Surfactant production in the fetus ramps up as the lungs mature, preparing the neonate to breathe at birth. Measuring how much surfactant is present in amniotic fluid relative to albumin provides a quantitative index of maturity. The fluorescence polarization method detects surfactant in a way that reflects its amount, and comparing it to albumin helps normalize variations in fluid composition. As gestation progresses and lungs mature, the surfactant/albumin ratio rises; a higher ratio suggests the fetus has developed sufficient pulmonary surfactant to reduce risks like respiratory distress after birth. This is not about lipid levels, coronary disease, or immune-related newborn conditions, but specifically about whether the lungs are ready for air breathing.